qcacmn: Initialized pdev id with default value 0xFF

pdev_id is being initialized with 0. Since 0 is valid pdev_id, though
pdev is not present for that id, it is being accessed.

Initialized pdev_id to 0xFF by default. Added checks on API to
detect valid pdev_id value corresponding to lmac_id

Change-Id: I2b2a38783615494ccc08e265702815f7e562214b

dp/inc/cdp_txrx_cmn.h

@@ -1925,7 +1925,7 @@ cdp_soc_handle_mode_change(ol_txrx_soc_handle soc, uint8_t pdev_id,
 	}
 
 	if (!soc->ops->cmn_drv_ops ||
-	    !soc->ops->cmn_drv_ops->map_pdev_to_lmac)
+	    !soc->ops->cmn_drv_ops->handle_mode_change)
 		return QDF_STATUS_E_FAILURE;
 
 	return soc->ops->cmn_drv_ops->handle_mode_change(soc, pdev_id,